Led lamp

Abstract

An LED lamp includes a concave lamp enclosure, a base, a plurality of LEDs and a lens. The base is received in the lamp enclosure and located at a bottom of the lamp enclosure. The base has a curved, concave top surface. The LEDs are distributed on the top surface of the base. The lens is received in the lamp enclosure and located over the LEDs. The lens has a curved, convex light input surface. The light input surface faces and spaces from the top surface of the base to define a space between the light input surface of the lens and the top surface of the base.

1 . An LED lamp comprises:
 a base including a concave top surface;   a plurality of LEDs distributed on the top surface of the base; and   a lens located over the LEDs, the lens including a convex light input surface, the light input surface facing and spaced from the top surface of the base to define a space between the light input surface of the lens and the top surface of the base.   
   
   
       2 . The LED lamp of  claim 1 , wherein the top surface is a part of a spherical surface, the top surface has a focal point as a central point of the spherical surface in which the top surface is located, a focus of the lens is coincident with the focal point of the top surface. 
   
   
       3 . The LED lamp of  claim 1 , wherein a plurality of recesses are defined in the top surface of the base, a plurality of LED chips are received in the recesses respectively, and a light penetrable material is filled into each of the recesses and encapsulates the chips, the LED chips and the light penetrable material constituting the LEDs. 
   
   
       4 . The LED lamp of  claim 1 , wherein the LEDs are evenly distributed on the top surface of the base. 
   
   
       5 . The LED lamp of  claim 1 , further comprising a hollow lamp enclosure receiving the base, the LEDs and the lens therein, a bottom end of the lamp enclosure is closed, and a top end of the lamp enclosure is opened and receives the lens therein. 
   
   
       6 . The LED lamp of  claim 5 , wherein the lamp enclosure includes a bottom wall and a lateral wall extending upwardly from a periphery of the bottom wall, the base is separately formed and then assembled to the lamp enclosure, a bottom surface of the base is attached to the bottom wall of the lamp enclosure. 
   
   
       7 . The LED lamp of  claim 5 , wherein the lamp enclosure includes a bottom wall and a lateral wall extending integrally upwardly from a periphery of the bottom wall, the bottom wall forms the base of the LED lamp. 
   
   
       8 . The LED lamp of  claim 6 , wherein the base has a column shape, and a lateral surface of the base is attached to a bottom portion of the lateral wall of the lamp enclosure. 
   
   
       9 . The LED lamp of  claim 8 , wherein the lens has a column shape, and a lateral surface of the lens is attached to a top portion of the lateral wall of the lamp enclosure. 
   
   
       10 . The LED lamp of  claim 1 , wherein the light input surface is located at a bottom end of the lens, and an output surface is formed at a top end of the lens and faces an outside of the LED lamp. 
   
   
       11 . The LED lamp of  claim 1 , wherein the top surface of the base is depressed downwardly from a periphery to a center thereof so that a vertical length of the base decreases gradually from the periphery to the center of the top surface. 
   
   
       12 . The LED lamp of  claim 1 , wherein the light input surface protrudes downwardly from a periphery to a center thereof so that a vertical length of the lens increases gradually from the periphery to the center of the light input surface.